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85e747d2 | 1 | /* Cell SPU GNU/Linux support -- shared library handling. |
4c38e0a4 | 2 | Copyright (C) 2009, 2010 Free Software Foundation, Inc. |
85e747d2 UW |
3 | |
4 | Contributed by Ulrich Weigand <uweigand@de.ibm.com>. | |
5 | ||
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
dcf7800b | 10 | the Free Software Foundation; either version 3 of the License, or |
85e747d2 UW |
11 | (at your option) any later version. |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
dcf7800b | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
85e747d2 UW |
20 | |
21 | #include "defs.h" | |
22 | #include "gdbcore.h" | |
23 | #include "gdb_string.h" | |
24 | #include "gdb_assert.h" | |
25 | #include "gdb_stat.h" | |
26 | #include "arch-utils.h" | |
27 | #include "bfd.h" | |
28 | #include "symtab.h" | |
29 | #include "solib.h" | |
30 | #include "solib-svr4.h" | |
31 | #include "solist.h" | |
32 | #include "inferior.h" | |
33 | #include "objfiles.h" | |
34 | #include "observer.h" | |
35 | #include "breakpoint.h" | |
36 | #include "gdbthread.h" | |
37 | ||
38 | #include "spu-tdep.h" | |
39 | ||
40 | /* Highest SPE id (file handle) the inferior may have. */ | |
41 | #define MAX_SPE_FD 1024 | |
42 | ||
43 | /* Stand-alone SPE executable? */ | |
44 | #define spu_standalone_p() \ | |
45 | (symfile_objfile && symfile_objfile->obfd \ | |
46 | && bfd_get_arch (symfile_objfile->obfd) == bfd_arch_spu) | |
47 | ||
48 | ||
49 | /* Relocate main SPE executable. */ | |
50 | static void | |
51 | spu_relocate_main_executable (int spufs_fd) | |
52 | { | |
85e747d2 UW |
53 | struct section_offsets *new_offsets; |
54 | int i; | |
55 | ||
567995e1 JK |
56 | if (symfile_objfile == NULL) |
57 | return; | |
85e747d2 | 58 | |
567995e1 JK |
59 | new_offsets = alloca (symfile_objfile->num_sections |
60 | * sizeof (struct section_offsets)); | |
85e747d2 | 61 | |
567995e1 JK |
62 | for (i = 0; i < symfile_objfile->num_sections; i++) |
63 | new_offsets->offsets[i] = SPUADDR (spufs_fd, 0); | |
64 | ||
65 | objfile_relocate (symfile_objfile, new_offsets); | |
85e747d2 UW |
66 | } |
67 | ||
68 | /* When running a stand-alone SPE executable, we may need to skip one more | |
69 | exec event on startup, to get past the binfmt_misc loader. */ | |
70 | static void | |
71 | spu_skip_standalone_loader (void) | |
72 | { | |
73 | if (target_has_execution && !current_inferior ()->attach_flag) | |
74 | { | |
75 | struct target_waitstatus ws; | |
76 | ||
77 | /* Only some kernels report an extra SIGTRAP with the binfmt_misc | |
78 | loader; others do not. In addition, if we have attached to an | |
79 | already running inferior instead of starting a new one, we will | |
80 | not see the extra SIGTRAP -- and we cannot readily distinguish | |
81 | the two cases, in particular with the extended-remote target. | |
82 | ||
83 | Thus we issue a single-step here. If no extra SIGTRAP was pending, | |
84 | this will step past the first instruction of the stand-alone SPE | |
85 | executable loader, but we don't care about that. */ | |
86 | ||
87 | inferior_thread ()->in_infcall = 1; /* Suppress MI messages. */ | |
88 | ||
89 | target_resume (inferior_ptid, 1, TARGET_SIGNAL_0); | |
90 | target_wait (minus_one_ptid, &ws, 0); | |
91 | set_executing (minus_one_ptid, 0); | |
92 | ||
93 | inferior_thread ()->in_infcall = 0; | |
94 | } | |
95 | } | |
96 | ||
97 | /* Build a list of `struct so_list' objects describing the shared | |
98 | objects currently loaded in the inferior. */ | |
99 | static struct so_list * | |
100 | spu_current_sos (void) | |
101 | { | |
102 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); | |
103 | struct so_list *head; | |
104 | struct so_list **link_ptr; | |
105 | ||
106 | char buf[MAX_SPE_FD * 4]; | |
107 | int i, size; | |
108 | ||
109 | /* First, retrieve the SVR4 shared library list. */ | |
110 | head = svr4_so_ops.current_sos (); | |
111 | ||
112 | /* Append our libraries to the end of the list. */ | |
113 | for (link_ptr = &head; *link_ptr; link_ptr = &(*link_ptr)->next) | |
114 | ; | |
115 | ||
116 | /* Determine list of SPU ids. */ | |
117 | size = target_read (¤t_target, TARGET_OBJECT_SPU, NULL, | |
118 | buf, 0, sizeof buf); | |
119 | ||
120 | /* Do not add stand-alone SPE executable context as shared library, | |
121 | but relocate main SPE executable objfile. */ | |
122 | if (spu_standalone_p ()) | |
123 | { | |
124 | if (size == 4) | |
125 | { | |
126 | int fd = extract_unsigned_integer (buf, 4, byte_order); | |
433759f7 | 127 | |
85e747d2 UW |
128 | spu_relocate_main_executable (fd); |
129 | ||
130 | /* Re-enable breakpoints after main SPU context was established; | |
131 | see also comments in spu_solib_create_inferior_hook. */ | |
132 | enable_breakpoints_after_startup (); | |
133 | } | |
134 | ||
135 | return head; | |
136 | } | |
137 | ||
138 | /* Create an so_list entry for each SPU id. */ | |
139 | for (i = 0; i < size; i += 4) | |
140 | { | |
141 | int fd = extract_unsigned_integer (buf + i, 4, byte_order); | |
142 | struct so_list *new; | |
143 | ||
144 | unsigned long long addr; | |
145 | char annex[32], id[100]; | |
146 | int len; | |
147 | ||
148 | /* Read object ID. There's a race window where the inferior may have | |
149 | already created the SPE context, but not installed the object-id | |
150 | yet. Skip such entries; we'll be back for them later. */ | |
151 | xsnprintf (annex, sizeof annex, "%d/object-id", fd); | |
152 | len = target_read (¤t_target, TARGET_OBJECT_SPU, annex, | |
153 | id, 0, sizeof id); | |
154 | if (len <= 0 || len >= sizeof id) | |
155 | continue; | |
156 | id[len] = 0; | |
157 | if (sscanf (id, "0x%llx", &addr) != 1 || !addr) | |
158 | continue; | |
159 | ||
160 | /* Allocate so_list structure. */ | |
161 | new = XZALLOC (struct so_list); | |
162 | ||
163 | /* Encode FD and object ID in path name. Choose the name so as not | |
164 | to conflict with any (normal) SVR4 library path name. */ | |
2244ba2e PM |
165 | xsnprintf (new->so_name, sizeof new->so_name, "@%s <%d>", |
166 | hex_string (addr), fd); | |
85e747d2 UW |
167 | strcpy (new->so_original_name, new->so_name); |
168 | ||
169 | *link_ptr = new; | |
170 | link_ptr = &new->next; | |
171 | } | |
172 | ||
173 | return head; | |
174 | } | |
175 | ||
176 | /* Free so_list information. */ | |
177 | static void | |
178 | spu_free_so (struct so_list *so) | |
179 | { | |
180 | if (so->so_original_name[0] != '@') | |
181 | svr4_so_ops.free_so (so); | |
182 | } | |
183 | ||
184 | /* Relocate section addresses. */ | |
185 | static void | |
186 | spu_relocate_section_addresses (struct so_list *so, | |
187 | struct target_section *sec) | |
188 | { | |
189 | if (so->so_original_name[0] != '@') | |
190 | svr4_so_ops.relocate_section_addresses (so, sec); | |
191 | else | |
192 | { | |
193 | unsigned long long addr; | |
194 | int fd; | |
195 | ||
196 | /* Set addr_low/high to just LS offset for display. */ | |
197 | if (so->addr_low == 0 && so->addr_high == 0 | |
198 | && strcmp (sec->the_bfd_section->name, ".text") == 0) | |
199 | { | |
200 | so->addr_low = sec->addr; | |
201 | so->addr_high = sec->endaddr; | |
202 | } | |
203 | ||
204 | /* Decode object ID. */ | |
205 | if (sscanf (so->so_original_name, "@0x%llx <%d>", &addr, &fd) != 2) | |
206 | internal_error (__FILE__, __LINE__, "bad object ID"); | |
207 | ||
208 | sec->addr = SPUADDR (fd, sec->addr); | |
209 | sec->endaddr = SPUADDR (fd, sec->endaddr); | |
210 | } | |
211 | } | |
212 | ||
213 | ||
214 | /* Inferior memory should contain an SPE executable image at location ADDR. | |
215 | Allocate a BFD representing that executable. Return NULL on error. */ | |
216 | ||
217 | static void * | |
218 | spu_bfd_iovec_open (bfd *nbfd, void *open_closure) | |
219 | { | |
220 | return open_closure; | |
221 | } | |
222 | ||
223 | static int | |
224 | spu_bfd_iovec_close (bfd *nbfd, void *stream) | |
225 | { | |
226 | xfree (stream); | |
227 | return 1; | |
228 | } | |
229 | ||
230 | static file_ptr | |
231 | spu_bfd_iovec_pread (bfd *abfd, void *stream, void *buf, | |
232 | file_ptr nbytes, file_ptr offset) | |
233 | { | |
234 | CORE_ADDR addr = *(CORE_ADDR *)stream; | |
235 | int ret; | |
236 | ||
237 | ret = target_read_memory (addr + offset, buf, nbytes); | |
238 | if (ret != 0) | |
239 | { | |
240 | bfd_set_error (bfd_error_invalid_operation); | |
241 | return -1; | |
242 | } | |
243 | ||
244 | return nbytes; | |
245 | } | |
246 | ||
247 | static int | |
248 | spu_bfd_iovec_stat (bfd *abfd, void *stream, struct stat *sb) | |
249 | { | |
250 | /* We don't have an easy way of finding the size of embedded spu | |
251 | images. We could parse the in-memory ELF header and section | |
252 | table to find the extent of the last section but that seems | |
253 | pointless when the size is needed only for checks of other | |
254 | parsed values in dbxread.c. */ | |
255 | sb->st_size = INT_MAX; | |
256 | return 0; | |
257 | } | |
258 | ||
259 | static bfd * | |
260 | spu_bfd_fopen (char *name, CORE_ADDR addr) | |
261 | { | |
262 | bfd *nbfd; | |
263 | ||
264 | CORE_ADDR *open_closure = xmalloc (sizeof (CORE_ADDR)); | |
265 | *open_closure = addr; | |
266 | ||
267 | nbfd = bfd_openr_iovec (xstrdup (name), "elf32-spu", | |
268 | spu_bfd_iovec_open, open_closure, | |
269 | spu_bfd_iovec_pread, spu_bfd_iovec_close, | |
270 | spu_bfd_iovec_stat); | |
271 | if (!nbfd) | |
272 | return NULL; | |
273 | ||
274 | if (!bfd_check_format (nbfd, bfd_object)) | |
275 | { | |
276 | bfd_close (nbfd); | |
277 | return NULL; | |
278 | } | |
279 | ||
280 | return nbfd; | |
281 | } | |
282 | ||
283 | /* Open shared library BFD. */ | |
284 | static bfd * | |
285 | spu_bfd_open (char *pathname) | |
286 | { | |
287 | char *original_name = strrchr (pathname, '@'); | |
288 | bfd *abfd; | |
289 | asection *spu_name; | |
290 | unsigned long long addr; | |
291 | int fd; | |
292 | ||
293 | /* Handle regular SVR4 libraries. */ | |
294 | if (!original_name) | |
295 | return svr4_so_ops.bfd_open (pathname); | |
296 | ||
297 | /* Decode object ID. */ | |
298 | if (sscanf (original_name, "@0x%llx <%d>", &addr, &fd) != 2) | |
299 | internal_error (__FILE__, __LINE__, "bad object ID"); | |
300 | ||
301 | /* Open BFD representing SPE executable. */ | |
302 | abfd = spu_bfd_fopen (original_name, (CORE_ADDR) addr); | |
303 | if (!abfd) | |
304 | error (_("Cannot read SPE executable at %s"), original_name); | |
305 | ||
306 | /* Retrieve SPU name note. */ | |
307 | spu_name = bfd_get_section_by_name (abfd, ".note.spu_name"); | |
308 | if (spu_name) | |
309 | { | |
310 | int sect_size = bfd_section_size (abfd, spu_name); | |
433759f7 | 311 | |
85e747d2 UW |
312 | if (sect_size > 20) |
313 | { | |
314 | char *buf = alloca (sect_size - 20 + strlen (original_name) + 1); | |
433759f7 | 315 | |
85e747d2 UW |
316 | bfd_get_section_contents (abfd, spu_name, buf, 20, sect_size - 20); |
317 | buf[sect_size - 20] = '\0'; | |
318 | ||
319 | strcat (buf, original_name); | |
320 | ||
321 | xfree ((char *)abfd->filename); | |
322 | abfd->filename = xstrdup (buf); | |
323 | } | |
324 | } | |
325 | ||
326 | return abfd; | |
327 | } | |
328 | ||
329 | /* Lookup global symbol in a SPE executable. */ | |
330 | static struct symbol * | |
331 | spu_lookup_lib_symbol (const struct objfile *objfile, | |
332 | const char *name, | |
85e747d2 UW |
333 | const domain_enum domain) |
334 | { | |
335 | if (bfd_get_arch (objfile->obfd) == bfd_arch_spu) | |
94af9270 | 336 | return lookup_global_symbol_from_objfile (objfile, name, domain); |
85e747d2 UW |
337 | |
338 | if (svr4_so_ops.lookup_lib_global_symbol != NULL) | |
94af9270 | 339 | return svr4_so_ops.lookup_lib_global_symbol (objfile, name, domain); |
85e747d2 UW |
340 | return NULL; |
341 | } | |
342 | ||
343 | /* Enable shared library breakpoint. */ | |
344 | static int | |
345 | spu_enable_break (struct objfile *objfile) | |
346 | { | |
347 | struct minimal_symbol *spe_event_sym = NULL; | |
348 | ||
349 | /* The libspe library will call __spe_context_update_event whenever any | |
350 | SPE context is allocated or destroyed. */ | |
351 | spe_event_sym = lookup_minimal_symbol ("__spe_context_update_event", | |
352 | NULL, objfile); | |
353 | ||
354 | /* Place a solib_event breakpoint on the symbol. */ | |
355 | if (spe_event_sym) | |
356 | { | |
357 | CORE_ADDR addr = SYMBOL_VALUE_ADDRESS (spe_event_sym); | |
433759f7 | 358 | |
85e747d2 UW |
359 | addr = gdbarch_convert_from_func_ptr_addr (target_gdbarch, addr, |
360 | ¤t_target); | |
361 | create_solib_event_breakpoint (target_gdbarch, addr); | |
362 | return 1; | |
363 | } | |
364 | ||
365 | return 0; | |
366 | } | |
367 | ||
368 | /* Create inferior hook. */ | |
369 | static void | |
268a4a75 | 370 | spu_solib_create_inferior_hook (int from_tty) |
85e747d2 | 371 | { |
85e747d2 UW |
372 | /* Handle SPE stand-alone executables. */ |
373 | if (spu_standalone_p ()) | |
374 | { | |
375 | /* After an SPE stand-alone executable was loaded, we'll receive | |
376 | an additional trap due to the binfmt_misc handler. Make sure | |
377 | to skip that trap. */ | |
378 | spu_skip_standalone_loader (); | |
379 | ||
380 | /* If the user established breakpoints before starting the inferior, GDB | |
381 | would attempt to insert those now. This would fail because the SPU | |
382 | context has not yet been created and the SPU executable has not yet | |
383 | been loaded. To prevent such failures, we disable all user-created | |
384 | breakpoints now; they will be re-enabled in spu_current_sos once the | |
385 | main SPU context has been detected. */ | |
386 | disable_breakpoints_before_startup (); | |
387 | ||
388 | /* A special case arises when re-starting an executable, because at | |
389 | this point it still resides at the relocated address range that was | |
390 | determined during its last execution. We need to undo the relocation | |
391 | so that that multi-architecture target recognizes the stand-alone | |
392 | initialization special case. */ | |
393 | spu_relocate_main_executable (-1); | |
394 | } | |
395 | ||
396 | /* Call SVR4 hook -- this will re-insert the SVR4 solib breakpoints. */ | |
268a4a75 | 397 | svr4_so_ops.solib_create_inferior_hook (from_tty); |
85e747d2 UW |
398 | |
399 | /* If the inferior is statically linked against libspe, we need to install | |
400 | our own solib breakpoint right now. Otherwise, it will be installed by | |
401 | the solib_loaded observer below as soon as libspe is loaded. */ | |
402 | spu_enable_break (NULL); | |
403 | } | |
404 | ||
405 | /* Install SPE "shared library" handling. This is called by -tdep code | |
406 | that wants to support SPU as a secondary architecture. */ | |
407 | void | |
408 | set_spu_solib_ops (struct gdbarch *gdbarch) | |
409 | { | |
410 | static struct target_so_ops spu_so_ops; | |
411 | ||
412 | /* Initialize this lazily, to avoid an initialization order | |
413 | dependency on solib-svr4.c's _initialize routine. */ | |
414 | if (spu_so_ops.current_sos == NULL) | |
415 | { | |
416 | spu_so_ops = svr4_so_ops; | |
417 | spu_so_ops.solib_create_inferior_hook = spu_solib_create_inferior_hook; | |
418 | spu_so_ops.relocate_section_addresses = spu_relocate_section_addresses; | |
419 | spu_so_ops.free_so = spu_free_so; | |
420 | spu_so_ops.current_sos = spu_current_sos; | |
421 | spu_so_ops.bfd_open = spu_bfd_open; | |
422 | spu_so_ops.lookup_lib_global_symbol = spu_lookup_lib_symbol; | |
423 | } | |
424 | ||
425 | set_solib_ops (gdbarch, &spu_so_ops); | |
426 | } | |
427 | ||
428 | /* Observer for the solib_loaded event. Used to install our breakpoint | |
429 | if libspe is a shared library. */ | |
430 | static void | |
431 | spu_solib_loaded (struct so_list *so) | |
432 | { | |
433 | if (strstr (so->so_original_name, "/libspe") != NULL) | |
434 | { | |
7e559477 | 435 | solib_read_symbols (so, 0); |
85e747d2 UW |
436 | spu_enable_break (so->objfile); |
437 | } | |
438 | } | |
439 | ||
440 | void | |
441 | _initialize_spu_solib (void) | |
442 | { | |
443 | observer_attach_solib_loaded (spu_solib_loaded); | |
444 | } | |
445 |